Frequencies for first 10,000 rows of drug1cl3 variable in nhamcsed2002 dataset :

   drug1cl3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,708       97.08       97.08
       0514 |          1        0.01       97.09
       1374 |         28        0.28       97.37
       1567 |          4        0.04       97.41
       1568 |         20        0.20       97.61
       1569 |          1        0.01       97.62
       1670 |          2        0.02       97.64
       1727 |          1        0.01       97.65
       1728 |         96        0.96       98.61
       1940 |          3        0.03       98.64
       1943 |          1        0.01       98.65
       1944 |         94        0.94       99.59
       1945 |         40        0.40       99.99
       2095 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016